对罗等人提出的前向安全的ElGamal型多重数字签名方案进行了安全性分析,指出该方案不具有前向安全性。当某个签名人的签名密钥泄露后,该方案存在伪造攻击。最后,改进了这个方案,并分析了新方案的安全性。新方案能够抵抗伪造攻击和联合攻击,是一个安全、高效、实用的前向安全的多重签名方案。
This paper gave security analysis of the multisignature schemes ——Luo et al. ' s forward-secure muhisignature scheme based on ElGamal type. The scheme didn' t meet property of forward security while some signer' s key was compromised. LUO' s scheme could' t resist forge attack. And finally, proposed the new improved scheme, analysed its security. The scheme can effectively resist forge attack and coordinate attacks: It's a safe, efficient, practical and forward secure multisignature scheme.